Recommended values for mergeFactor, minMergeDocs, maxMergeDocs
http://marc.theaimsgroup.com/?l=lucene-user&m=110235452004799&w=2

Best Practices for Distributing Lucene Indexing and Searching
http://marc.theaimsgroup.com/?l=lucene-user&m=110973989200204&w=2

Optimizing for long queries
http://marc.theaimsgroup.com/?l=lucene-user&m=108840979004587&w=2
http://marc.theaimsgroup.com/?l=lucene-user&m=110969921306938&w=2

ParallellMultiSearcher Vs. One big Index
http://marc.theaimsgroup.com/?l=lucene-user&m=110607674000954&w=2

Lucene Performance Bottlenecks
http://marc.theaimsgroup.com/?l=lucene-user&m=113352444722705&w=2

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